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Updated 8-point interpolation

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pagefault
2001-09-06 14:47:07 +00:00
parent 03d3ce064b
commit 5ee45932e0
2 changed files with 44 additions and 11 deletions
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23
zsnes/src/zip/fir_proc.cpp
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@@ -9,11 +9,8 @@
*
*/
#ifdef __LINUX__
#include "../gblhdr.h"
#else
#include <math.h>
#endif
#include <stdio.h>
#ifndef log2
inline float log2(float f) {
@@ -55,7 +52,7 @@ inline float log2(float f) {
------------------------------------------------------------------------------------------------
*/
// quantizer scale of window coefs
#define WFIR_QUANTBITS 15
#define WFIR_QUANTBITS 14
#define WFIR_QUANTSCALE (1L<<WFIR_QUANTBITS)
#define WFIR_8SHIFT (WFIR_QUANTBITS-8)
#define WFIR_16BITSHIFT (WFIR_QUANTBITS)
@@ -137,11 +134,11 @@ class CzWINDOWEDFIR
}
return (float)(_LWc*_LSi);
}
static signed int lut[WFIR_LUTLEN*WFIR_WIDTH];
static signed short lut[WFIR_LUTLEN*WFIR_WIDTH];
static signed int lut_co[WFIR_CUTOFFLEN*WFIR_WIDTH];
};
signed int CzWINDOWEDFIR::lut[WFIR_LUTLEN*WFIR_WIDTH];
signed short CzWINDOWEDFIR::lut[WFIR_LUTLEN*WFIR_WIDTH];
signed int CzWINDOWEDFIR::lut_co[WFIR_CUTOFFLEN*WFIR_WIDTH];
CzWINDOWEDFIR::CzWINDOWEDFIR()
@@ -161,7 +158,7 @@ CzWINDOWEDFIR::CzWINDOWEDFIR()
_LGain = 1.0f/_LGain;
for( _LCc=0;_LCc<WFIR_WIDTH;_LCc++ )
{ float _LCoef = (float)floor( 0.5 + _LScale*_LCoefs[_LCc]*_LGain );
lut[_LIdx+_LCc] = (signed int)( (_LCoef<-_LScale)?-_LScale:((_LCoef>_LScale)?_LScale:_LCoef) );
lut[_LIdx+_LCc] = (signed short)( (_LCoef<-_LScale)?-_LScale:((_LCoef>_LScale)?_LScale:_LCoef) );
}
}
for( _LPcl=0;_LPcl<WFIR_CUTOFFLEN;_LPcl++ )
@@ -260,9 +257,13 @@ inline int __fir_interpolate(unsigned int nPos, int *p)
return vol;
}
extern "C" int fir_interpolate(unsigned int nPos, int *p)
{
return __fir_interpolate(nPos, p);
extern "C" {
signed short *fir_lut = &CzWINDOWEDFIR::lut[0];
int fir_interpolate(unsigned int nPos, int *p)
{
return __fir_interpolate(nPos, p);
}
}
#define WFIR_CUTOFFSHIFT (32-(WFIR_CUTOFFBITS+WFIR_LOG2WIDTH))